This patch adds netevent and netlink calls for neighbour change, route
add/del, pmtu change, and routing redirect events.
Netlink Details:
Neighbour change events are broadcast as a new ndmsg type RTM_NEIGHUPD.
Path mtu change events are broadcast as a new rtmsg type RTM_ROUTEUPD.
Routing redirect events are broadcast as a pair of rtmsgs, RTM_DELROUTE
and RTM_NEWROUTE.
---
include/linux/rtnetlink.h | 4 ++
net/core/Makefile | 2 +
net/core/neighbour.c | 37 ++++++++++++++++---
net/ipv4/fib_semantics.c | 9 +++++
net/ipv4/route.c | 86 ++++++++++++++++++++++++++++++++++++++++++--
net/ipv6/route.c | 87 +++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 213 insertions(+), 12 deletions(-)
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index facd9ee..340ca4f 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -35,6 +35,8 @@ #define RTM_NEWROUTE RTM_NEWROUTE
#define RTM_DELROUTE RTM_DELROUTE
RTM_GETROUTE,
#define RTM_GETROUTE RTM_GETROUTE
+ RTM_ROUTEUPD,
+#define RTM_ROUTEUPD RTM_ROUTEUPD
RTM_NEWNEIGH = 28,
#define RTM_NEWNEIGH RTM_NEWNEIGH
@@ -42,6 +44,8 @@ #define RTM_NEWNEIGH RTM_NEWNEIGH
#define RTM_DELNEIGH RTM_DELNEIGH
RTM_GETNEIGH,
#define RTM_GETNEIGH RTM_GETNEIGH
+ RTM_NEIGHUPD,
+#define RTM_NEIGHUPD RTM_NEIGHUPD
RTM_NEWRULE = 32,
#define RTM_NEWRULE RTM_NEWRULE
diff --git a/net/core/Makefile b/net/core/Makefile
index e9bd246..2645ba4 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -7,7 +7,7 @@ obj-y := sock.o request_sock.o skbuff.o
obj-$(CONFIG_SYSCTL) += sysctl_net_core.o
-obj-y += dev.o ethtool.o dev_mcast.o dst.o \
+obj-y += dev.o ethtool.o dev_mcast.o dst.o netevent.o \
neighbour.o rtnetlink.o utils.o link_watch.o filter.o
obj-$(CONFIG_XFRM) += flow.o
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 7ad681f..11c7643 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -29,9 +29,11 @@ #include <linux/times.h>
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/sock.h>
+#include <net/netevent.h>
#include <linux/rtnetlink.h>
#include <linux/random.h>
#include <linux/string.h>
+#include <linux/notifier.h>
#define NEIGH_DEBUG 1
@@ -58,6 +60,7 @@ static void neigh_app_notify(struct neig
#endif
static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
+static void rtm_neigh_change(struct neighbour *n);
static struct neigh_table *neigh_tables;
#ifdef CONFIG_PROC_FS
@@ -754,6 +757,7 @@ #endif
neigh->nud_state = NUD_STALE;
neigh->updated = jiffies;
neigh_suspect(neigh);
+ notify = 1;
}
} else if (state & NUD_DELAY) {
if (time_before_eq(now,
@@ -762,6 +766,7 @@ #endif
neigh->nud_state = NUD_REACHABLE;
neigh->updated = jiffies;
neigh_connect(neigh);
+ notify = 1;
next = neigh->confirmed + neigh->parms->reachable_time;
} else {
NEIGH_PRINTK2("neigh %p is probed.\n", neigh);
@@ -819,6 +824,8 @@ #endif
out:
write_unlock(&neigh->lock);
}
+ if (notify)
+ rtm_neigh_change(neigh);
#ifdef CONFIG_ARPD
if (notify && neigh->parms->app_probes)
@@ -926,9 +933,7 @@ int neigh_update(struct neighbour *neigh
{
u8 old;
int err;
-#ifdef CONFIG_ARPD
int notify = 0;
-#endif
struct net_device *dev;
int update_isrouter = 0;
@@ -948,9 +953,7 @@ #endif
neigh_suspect(neigh);
neigh->nud_state = new;
err = 0;
-#ifdef CONFIG_ARPD
notify = old & NUD_VALID;
-#endif
goto out;
}
@@ -1022,9 +1025,7 @@ #endif
if (!(new & NUD_CONNECTED))
neigh->confirmed = jiffies -
(neigh->parms->base_reachable_time << 1);
-#ifdef CONFIG_ARPD
notify = 1;
-#endif
}
if (new == old)
goto out;
@@ -1055,7 +1056,11 @@ out:
(neigh->flags | NTF_ROUTER) :
(neigh->flags & ~NTF_ROUTER);
}
+
write_unlock_bh(&neigh->lock);
+
+ if (notify)
+ rtm_neigh_change(neigh);
#ifdef CONFIG_ARPD
if (notify && neigh->parms->app_probes)
neigh_app_notify(neigh);
@@ -2369,9 +2374,27 @@ static void neigh_app_notify(struct neig
NETLINK_CB(skb).dst_group = RTNLGRP_NEIGH;
netlink_broadcast(rtnl, skb, 0, RTNLGRP_NEIGH, GFP_ATOMIC);
}
-
#endif /* CONFIG_ARPD */
+static void rtm_neigh_change(struct neighbour *n)
+{
+ struct nlmsghdr *nlh;
+ int size = NLMSG_SPACE(sizeof(struct ndmsg) + 256);
+ struct sk_buff *skb = alloc_skb(size, GFP_ATOMIC);
+
+ call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n);
+ if (!skb)
+ return;
+
+ if (neigh_fill_info(skb, n, 0, 0, RTM_NEIGHUPD, 0) < 0) {
+ kfree_skb(skb);
+ return;
+ }
+ nlh = (struct nlmsghdr *)skb->data;
+ NETLINK_CB(skb).dst_group = RTNLGRP_NEIGH;
+ netlink_broadcast(rtnl, skb, 0, RTNLGRP_NEIGH, GFP_ATOMIC);
+}
+
#ifdef CONFIG_SYSCTL
static struct neigh_sysctl_table {
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 5f87533..33d8a83 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -44,6 +44,7 @@ #include <net/tcp.h>
#include <net/sock.h>
#include <net/ip_fib.h>
#include <net/ip_mp_alg.h>
+#include <net/netevent.h>
#include "fib_lookup.h"
@@ -279,6 +280,14 @@ void rtmsg_fib(int event, u32 key, struc
struct sk_buff *skb;
u32 pid = req ? req->pid : n->nlmsg_pid;
int size = NLMSG_SPACE(sizeof(struct rtmsg)+256);
+ struct netevent_route_info nri;
+ int netevent;
+
+ nri.family = AF_INET;
+ nri.data = &fa->fa_info;
+ netevent = event == RTM_NEWROUTE ? NETEVENT_ROUTE_ADD
+ : NETEVENT_ROUTE_DEL;
+ call_netevent_notifiers(netevent, &nri);
skb = alloc_skb(size, GFP_KERNEL);
if (!skb)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 2dc6dbb..18879e6 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -104,6 +104,7 @@ #include <net/tcp.h>
#include <net/icmp.h>
#include <net/xfrm.h>
#include <net/ip_mp_alg.h>
+#include <net/netevent.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
@@ -151,6 +152,8 @@ static struct dst_entry *ipv4_negative_a
static void ipv4_link_failure(struct sk_buff *skb);
static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
static int rt_garbage_collect(void);
+static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
+ int nowait, unsigned int flags, unsigned int prot);
static struct dst_ops ipv4_dst_ops = {
@@ -1117,6 +1120,52 @@ static void rt_del(unsigned hash, struct
spin_unlock_bh(rt_hash_lock_addr(hash));
}
+static void rtm_redirect(struct rtable *old, struct rtable *new)
+{
+ struct netevent_redirect netevent;
+ struct sk_buff *skb;
+ int err;
+
+ netevent.old = &old->u.dst;
+ netevent.new = &new->u.dst;
+
+ /* notify netevent subscribers */
+ call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
+
+ /* Post NETLINK messages: RTM_DELROUTE for old route,
+ RTM_NEWROUTE for new route */
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
+ if (!skb)
+ return;
+ skb->mac.raw = skb->nh.raw = skb->data;
+ skb->dst = &old->u.dst;
+ NETLINK_CB(skb).dst_pid = 0;
+
+ err = rt_fill_info(skb, 0, 0, RTM_DELROUTE, 1, 0, RTPROT_UNSPEC);
+ if (err <= 0)
+ goto out_free;
+
+ netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV4_ROUTE, GFP_ATOMIC);
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
+ if (!skb)
+ return;
+ skb->mac.raw = skb->nh.raw = skb->data;
+ skb->dst = &new->u.dst;
+ NETLINK_CB(skb).dst_pid = 0;
+
+ err = rt_fill_info(skb, 0, 0, RTM_NEWROUTE, 1, 0, RTPROT_REDIRECT);
+ if (err <= 0)
+ goto out_free;
+
+ netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV4_ROUTE, GFP_ATOMIC);
+ return;
+
+out_free:
+ kfree_skb(skb);
+ return;
+}
+
void ip_rt_redirect(u32 old_gw, u32 daddr, u32 new_gw,
u32 saddr, struct net_device *dev)
{
@@ -1216,6 +1265,8 @@ void ip_rt_redirect(u32 old_gw, u32 dadd
rt_drop(rt);
goto do_next;
}
+
+ rtm_redirect(rth, rt);
rt_del(hash, rth);
if (!rt_intern_hash(hash, rt, &rt))
@@ -1442,6 +1493,32 @@ unsigned short ip_rt_frag_needed(struct
return est_mtu ? : new_mtu;
}
+static void rtm_pmtu_update(struct rtable *rt)
+{
+ struct sk_buff *skb;
+ int err;
+
+ call_netevent_notifiers(NETEVENT_PMTU_UPDATE, &rt->u.dst);
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
+ if (!skb)
+ return;
+ skb->mac.raw = skb->nh.raw = skb->data;
+ skb->dst = &rt->u.dst;
+ NETLINK_CB(skb).dst_pid = 0;
+
+ err = rt_fill_info(skb, 0, 0, RTM_ROUTEUPD, 1, 0, RTPROT_UNSPEC);
+ if (err <= 0)
+ goto out_free;
+
+ netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV4_ROUTE, GFP_ATOMIC);
+ return;
+
+out_free:
+ kfree_skb(skb);
+ return;
+}
+
static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
{
if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= 68 &&
@@ -1452,6 +1529,7 @@ static void ip_rt_update_pmtu(struct dst
}
dst->metrics[RTAX_MTU-1] = mtu;
dst_set_expires(dst, ip_rt_mtu_expires);
+ rtm_pmtu_update((struct rtable *)dst);
}
}
@@ -2627,7 +2705,7 @@ int ip_route_output_key(struct rtable **
}
static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
- int nowait, unsigned int flags)
+ int nowait, unsigned int flags, unsigned int prot)
{
struct rtable *rt = (struct rtable*)skb->dst;
struct rtmsg *r;
@@ -2646,7 +2724,7 @@ #endif
r->rtm_table = RT_TABLE_MAIN;
r->rtm_type = rt->rt_type;
r->rtm_scope = RT_SCOPE_UNIVERSE;
- r->rtm_protocol = RTPROT_UNSPEC;
+ r->rtm_protocol = prot;
r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
if (rt->rt_flags & RTCF_NOTIFY)
r->rtm_flags |= RTM_F_NOTIFY;
@@ -2792,7 +2870,7 @@ int inet_rtm_getroute(struct sk_buff *in
NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
err = rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq,
- RTM_NEWROUTE, 0, 0);
+ RTM_NEWROUTE, 0, 0, RTPROT_UNSPEC);
if (!err)
goto out_free;
if (err < 0) {
@@ -2830,7 +2908,7 @@ int ip_rt_dump(struct sk_buff *skb, str
skb->dst = dst_clone(&rt->u.dst);
if (rt_fill_info(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, RTM_NEWROUTE,
- 1, NLM_F_MULTI) <= 0) {
+ 1, NLM_F_MULTI, RTPROT_UNSPEC) <= 0) {
dst_release(xchg(&skb->dst, NULL));
rcu_read_unlock_bh();
goto done;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 87c39c9..a2b1d53 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -53,6 +53,7 @@ #include <net/tcp.h>
#include <linux/rtnetlink.h>
#include <net/dst.h>
#include <net/xfrm.h>
+#include <net/netevent.h>
#include <asm/uaccess.h>
@@ -96,6 +97,10 @@ static int ip6_pkt_discard(struct sk_bu
static int ip6_pkt_discard_out(struct sk_buff *skb);
static void ip6_link_failure(struct sk_buff *skb);
static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
+static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
+ struct in6_addr *dst, struct in6_addr *src,
+ int iif, int type, u32 pid, u32 seq,
+ int prefix, unsigned int flags);
#ifdef CONFIG_IPV6_ROUTE_INFO
static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int
prefixlen,
@@ -731,6 +736,32 @@ static void ip6_link_failure(struct sk_b
}
}
+static void rtm_pmtu_update(struct rt6_info *rt)
+{
+ struct sk_buff *skb;
+ int err;
+
+ call_netevent_notifiers(NETEVENT_PMTU_UPDATE, &rt->u.dst);
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
+ if (!skb)
+ return;
+ skb->mac.raw = skb->nh.raw = skb->data;
+ skb->dst = &rt->u.dst;
+ NETLINK_CB(skb).dst_pid = 0;
+
+ err = rt6_fill_node(skb, rt, NULL, NULL, 0, RTM_ROUTEUPD, 0, 0, 0, 0);
+ if (err <= 0)
+ goto out_free;
+
+ netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_ROUTE, GFP_ATOMIC);
+ return;
+
+out_free:
+ kfree_skb(skb);
+ return;
+}
+
static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
{
struct rt6_info *rt6 = (struct rt6_info*)dst;
@@ -742,6 +773,7 @@ static void ip6_rt_update_pmtu(struct ds
dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
}
dst->metrics[RTAX_MTU-1] = mtu;
+ rtm_pmtu_update(rt6);
}
}
@@ -907,6 +939,7 @@ int ip6_route_add(struct in6_rtmsg *rtms
struct net_device *dev = NULL;
struct inet6_dev *idev = NULL;
int addr_type;
+ struct netevent_route_info nri;
rta = (struct rtattr **) _rtattr;
@@ -1085,6 +1118,9 @@ install_route:
rt->u.dst.metrics[RTAX_ADVMSS-1] =
ipv6_advmss(dst_mtu(&rt->u.dst));
rt->u.dst.dev = dev;
rt->rt6i_idev = idev;
+ nri.family = AF_INET6;
+ nri.data = rt;
+ call_netevent_notifiers(NETEVENT_ROUTE_ADD, &nri);
return ip6_ins_rt(rt, nlh, _rtattr, req);
out:
@@ -1116,6 +1152,7 @@ static int ip6_route_del(struct in6_rtms
struct fib6_node *fn;
struct rt6_info *rt;
int err = -ESRCH;
+ struct netevent_route_info nri;
read_lock_bh(&rt6_lock);
@@ -1137,6 +1174,10 @@ static int ip6_route_del(struct in6_rtms
continue;
dst_hold(&rt->u.dst);
read_unlock_bh(&rt6_lock);
+
+ nri.family = AF_INET6;
+ nri.data = rt;
+ call_netevent_notifiers(NETEVENT_ROUTE_DEL, &nri);
return ip6_del_rt(rt, nlh, _rtattr, req);
}
@@ -1146,6 +1187,50 @@ static int ip6_route_del(struct in6_rtms
return err;
}
+static void rtm_redirect(struct rt6_info *old, struct rt6_info *new)
+{
+ struct netevent_redirect netevent;
+ struct sk_buff *skb;
+ int err;
+
+ netevent.old = &old->u.dst;
+ netevent.new = &new->u.dst;
+ call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
+
+ /* Post NETLINK messages: RTM_DELROUTE for old route,
+ RTM_NEWROUTE for new route */
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
+ if (!skb)
+ return;
+ skb->mac.raw = skb->nh.raw = skb->data;
+ NETLINK_CB(skb).dst_pid = 0;
+ NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_ROUTE;
+
+ err = rt6_fill_node(skb, old, NULL, NULL, 0, RTM_DELROUTE, 0, 0, 0, 0);
+ if (err <= 0)
+ goto out_free;
+
+ netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_ROUTE, GFP_ATOMIC);
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
+ if (!skb)
+ return;
+ skb->mac.raw = skb->nh.raw = skb->data;
+ NETLINK_CB(skb).dst_pid = 0;
+ NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_ROUTE;
+
+ err = rt6_fill_node(skb, new, NULL, NULL, 0, RTM_NEWROUTE, 0, 0, 0, 0);
+ if (err <= 0)
+ goto out_free;
+
+ netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_ROUTE, GFP_ATOMIC);
+ return;
+
+out_free:
+ kfree_skb(skb);
+ return;
+}
+
/*
* Handle redirects
*/
@@ -1252,6 +1337,8 @@ restart:
if (ip6_ins_rt(nrt, NULL, NULL, NULL))
goto out;
+ rtm_redirect(rt, nrt);
+
if (rt->rt6i_flags&RTF_CACHE) {
ip6_del_rt(rt, NULL, NULL, NULL);
return;
-
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